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Finding the Fourth Proportional to 467.55, 645.37 and 320.61

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Solution

The fourth proportional to 467.55, 645.37 and 320.61 is: 442.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.55 : 645.37 = 320.61 : x
  2. Step 2: Convert to fraction form
    467.55/645.37 = 320.61/x
  3. Step 3: Cross multiply
    467.55x = 645.37 × 320.61
  4. Step 4: Simplify right side
    467.55x = 206,908.85
  5. Step 5: Solve for x
    x = 206,908.85/467.55
  6. Step 6: Final answer
    x = 442.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.